There are three pressure compartments in your ship: Forword, Aft, and Tail. (See Fig. 13). The forward and aft cabins are connected by a communicating tunnel running over the bomb-bay; the tail compartment is isolated when pressurized.
OPERATION: The cabins are pressurized from the superchargers of the two inboard engines. Your flight engineer controls the air-flow from these superchargers, permitting the cabin Pressure Regulators to automatically regulate the air pressure within the cabin. From ground level to 8,000 ft the cabins are not pressurized. When the cabins are under pressure, your cabin altitude will remain at 8,000 ft, while the ship is flying at any altitude up to 30,000 ft. When your ship gets about 30,000 ft, the cabin pressure will rise proportionately so that it reaches about 12,000 ft when the ship is at 40,000 ft. (See Fig. 14 for this pressure relation). Cabin temperature is controlled by thermostat.
Fig. 14
EMERGENCY PRESSURE RELEASE. Since all emergency doors open in, cabin pressure must be released in all emergencies. This is done by a valve controlled by cable from:
- Pilot's seat
- Behind R.H. side gunner
WHEN DO YOU NEED OXYGEN IN A B-29?
As long as the cabin altitude is below 10,000 ft you're O.K. without oxygen.
YOU MUST USE OXYGEN when the CABIN ALTITUDE goes ABOVE 10,000 feet.
This may occur: